Translocation of photoassimilates in melon vines and fruits under salinity using 13C isotope

Lima, Reivany Eduardo Morais; Farias, Luciana F. de L.; Ferreira, Jorge; Suarez, Donald L.; Bezerra, Marlos Alves

doi:10.1016/j.scienta.2020.109659

Cited by 10 publications

(11 citation statements)

References 41 publications

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“…This situation explains the results obtained for fresh fruit weight (Figure 4C) and mean fruit weight (Figure 4D), which showed reductions caused by irrigation with the water of higher salinity (3.2 dS m -1 ), with losses of 39.62% (676.02 g per plant) and 19.36% (14.54 g per fruit), respectively, when compared with the values obtained for plants grown with ECw of 0.6 dS m -1 . Lima et al (2020b) add that the losses of fruit growth under conditions of high salinity are consequences of metabolic and physiological disorders that reduce the production of sugars and, perhaps, their movement in phloem vessels, with the emergence of new sap sinks, in addition to the fruits, for the maintenance of growth. Similar responses to salinity in fruit development have also been reported in guava cv.…”

Section: Resultsmentioning

confidence: 99%

Morphophysiology and production of guava as a function of water salinity and salicylic acid

Lacerda

Lima

Soares

et al. 2022

Rev. bras. eng. agríc. ambient.

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The availability of water with low electrical conductivity for irrigation in the Northeastern semi-arid region is one of the limiting factors for the expansion of irrigated agriculture. Thus, it is necessary to use waters with high electrical conductivity, requiring the search for strategies to reduce the negative impacts of salts on plants. In this context, the objective of this study was to evaluate the morphophysiology and production of guava cv. Paluma subjected to irrigation with saline waters and foliar application of salicylic acid after grafting. The experiment was conducted under greenhouse conditions in Campina Grande - PB, Brazil, in a randomized block design, adopting a 2 × 4 factorial scheme, with two values of electrical conductivity of irrigation water - ECw (0.6 and 3.2 dS m-1) and four concentrations of salicylic acid (0, 1.2, 2.4 and 3.6 mM), with three replicates. Irrigation with water of 3.2 dS m-1 reduced gas exchange, rootstock and scion diameters, crown diameter and volume, vegetative vigor index, polar and equatorial diameters of fruit, number of fruits, mean fruit weight, and fresh fruit weight of fruits of guava cv. Paluma. Salicylic acid application up to 3.6 mM did not mitigate the effects of salt stress on grafted guava cv. Paluma, at 390 days after transplanting.

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Section: Resultsmentioning

confidence: 99%

Morphophysiology and production of guava as a function of water salinity and salicylic acid

Lacerda

Lima

Soares

et al. 2022

Rev. bras. eng. agríc. ambient.

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“…Because one fruit grew from one plant in this experiment, fruits were subjected to various stress conditions. Some reports indicated that sugar accumulation in Cucurbitaceae fruits is affected by stress (Kirnak and Dogan 2009;Lima et al 2020). However, the experimental design of those studies differed from that used in this study.…”

Section: Discussionmentioning

confidence: 85%

“…However, the experimental design of those studies differed from that used in this study. During most of the experiments, stress was applied using a salt (NaCl) solution or limited water irrigation (draught) under soil culture condition (Kirnak and Dogan 2009;Lima et al 2020;Proietti et al 2008). During this experiment, plants were cultured hydroponically and the culture solution was enriched by increasing the ratio of fertilizers.…”

Section: Discussionmentioning

confidence: 99%

“…An isotope analysis is frequently performed to investigate the transport of photosynthates in plants (Finazzo et al 1994;Okano et al 1983;Yakushiji et al 1998). In some studies, the translocation of photosynthates in Cucurbitaceae plants was investigated by an isotope analysis (Barzegar et al 2013;Lima et al 2020;Watanabe 2004). In this study, we applied the 13 CO 2 isotope to leaves of watermelon plants during fruit growth and determined the ratio of photosynthates translocated to different parts of the fruit flesh in which the sugar concentration and water status were measured and analyzed.…”

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confidence: 99%

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Active Sugar Accumulation and Water Status of Watermelon Fruit Grown under Different Nutrient Concentrations in Hydroponic Culture

Tomiyama

Yakushiji

Osawa

et al. 2023

horts

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We investigated sugar (solute) accumulation in watermelon [Citrullus lanatus (Thunb.) Matsum. et Nakai] fruits at the immature stage. Watermelon plants were grown hydroponically in a nutrient solution with an electric conductivity (EC) of 1.2 S⋅m−1 (EC 1.2 regime); then, fruits were harvested 21 days after anthesis. The flesh of each fruit was divided into seven different parts to measure the sugar concentration and water status. The results indicated that the sugar concentration was higher in the center of the fruit flesh than in the other parts, such as around the pericarp. Moreover, the lowest osmotic potential was observed in the center of the fruit flesh, indicating solute accumulation. Concurrently, when the transport of photosynthates in the fruit was investigated using the 13CO2 isotope, the active solute accumulation in the center of the fruit flesh was observed, supporting the observed sugar accumulation in this part. Consequently, this active solute accumulation and distribution occurred in the center of the watermelon fruit, as demonstrated by the data of osmotic pressure and sugar concentration and supported by the observed active photosynthate accumulation. Additionally, we investigated these measurements by increasing the nutrient solution concentration 14 days after anthesis. As a result, fruit growth was slightly inhibited using the EC 3.0 regime, and 13C translocation was also inhibited in the fruit, especially in its center. Even though the sugar concentration and osmotic pressure of the fruit flesh were not clearly affected by high nutrient solution concentrations, the cell turgor of the central flesh of the fruit grown using the EC 2.0 and 3.0 regimes was lower than that of the fruit grown using the EC 1.2 regime. Treatments with higher nutrient concentrations might have negative effects on immature watermelon fruits.

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“…Salinity reduces crop yield, and decreases the quality of agricultural products e.g. seeds, fruits, and bre [2][3][4]. Giving the fact that breeding salt tolerant crop species requires long time and the practical approach such as saturating saline soil with fresh water is not affordable in many areas, especially the semi-arid area, techniques which can help to improve crop salt tolerance in the production period is a feasible option for farmer to choose.…”

Section: Introductionmentioning

confidence: 99%

Cerium Oxide Nanoparticles Improve Cotton Salt Tolerance by Enabling Better Ability to Maintain Cytosolic K+/Na+ Ratio

Chen

et al. 2021

Preprint

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BackgroundSalinity is a worldwide factor limiting the agricultural production. Cotton is an important cash crop; however, its yield and product quality are negatively affected by salinity. Using nanomaterials such as cerium oxide nanoparticles (nanoceria) to improve plant tolerance to stresses, e.g. salinity, is an emerged approach in agricultural production. Nevertheless, to date, our knowledge about the role of nanoceria in cotton salt response and the behind mechanisms is still rare. ResultsWe found that PNC (poly acrylic acid coated nanoceria) helped to improve cotton plant tolerance to salinity, showing the better phenotypic performance, the higher chlorophyll content and biomass, and the better photosynthetic performance in PNC treated cotton plants than the control group. Under salinity stress, in consistent to the results of the enhanced antioxidant enzyme activities, PNC treated cotton plants showed significant lower MDA content and ROS level than the control group, both in the first and second true leaf. Further experiments showed that under salinity stress, PNC treated cotton plants had significant higher cytosolic K+ and lower cytosolic Na+ fluorescent intensity in both the first and second true leaf than the control group. This is further confirmed by the leaf ion content analysis, showed that PNC treated cotton plants maintained significant higher leaf K+ and lower leaf Na+ content, and thus the higher K+/Na+ ratio than the control plants under salinity. Whereas no significant increase of vacuolar Na+ intensity was observed in PNC treated plants than the control under salinity, suggesting that PNC enhanced leaf K+ retention and leaf Na+ exclusion, but not leaf vacuolar Na+ sequestration are the main mechanisms behind the PNC improved cotton salt tolerance. qPCR results showed that under salinity stress, the modulation of HKT1 but not SOS1 refers more to the PNC improved cotton leaf Na+ exclusion than the control. ConclusionsNanoceria enhanced leaf K+ retention and Na+ exclusion, but not vacuolar Na+ sequestration are the main mechanisms behind the nanoceria improved cotton salt tolerance. Our results add more knowledge for better understanding the complexity of plant-nanoceria interaction in terms of nano-enabled plant stress tolerance.

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Translocation of photoassimilates in melon vines and fruits under salinity using 13C isotope

Cited by 10 publications

References 41 publications

Morphophysiology and production of guava as a function of water salinity and salicylic acid

Morphophysiology and production of guava as a function of water salinity and salicylic acid

Active Sugar Accumulation and Water Status of Watermelon Fruit Grown under Different Nutrient Concentrations in Hydroponic Culture

Cerium Oxide Nanoparticles Improve Cotton Salt Tolerance by Enabling Better Ability to Maintain Cytosolic K+/Na+ Ratio

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